Elevator-controller.



W. C. ARNOLD & W. E. DATE.

ELEVATOR CONTROLLER;

APPLICATION FILED PHIL 23.1916.

1,262,617., Patented Apr. 16, 1918.

other words, it may be rendered so sluggish in its operation that unlessthe car is halted in its travel upon reaching a landing the link of theretiring cam will successively engage both hatchway cams correspondingto said landing with such rapidity as to prevent action of said retiringcam to release the door of such landing.

. Hence if a car is called to a particular landing all doors will bemaintained locked until the car reaches'and stops at said landing andstealing of the car by openlng of the door of some other landing will bepositively precluded. Moreover, it will be observed that the aforesaidoperation of the locking and tripping mechanism is in no wise dependentupon or affected by the elec trical system utilized for control of thecar.

What I claim as new and desire to secure by Letters Patent is:

1. In a control mechanism for elevator landing doors, the combinationwith a landing door lock, of means tending to trip said look uponlanding positioning of the elevator and self controlled means actingupon through operation of the elevator to prevent tripping action of theformer means.

2. In a control mechanism for elevator landing doors, the combinationwith a landing door lock, of a mechanicaldevicetending to trip said lookupon landing pos1t1oning of the elevator and self controlled meansfunctionally operable by power derlved from the elevator to preventtripping action of the former means except upon arrest of the elevatorin landing position.

3. In a control mechanism for the landing doors of an elevator, thecombination with a landing door lock, of means tending to trip said lockautomatically upon landing positioning of the elevator, said means beingineffective in all other positions of the elevator and includingmeans-providing a time element in the tripping action thereof whereby itis rendered ineffective for tripping of said lock except upon arrest ofthe elevator. V

4. In acontrol mechanism for the landing doors of an elevator, thecombination with a lock for each door, of mechanical means for trippingsaid locks automatically upon positioning of the elevator at landingscorresponding to said locks, said means being effective only in landingpositions of the elevator and including means providing a time elementin the tripping action thereof whereby it is rendered inefi'ective fortripping said locks except upon arrest of the elevator. i

5. In a control mechanism for elevator landing doors, the combinationwith a lock for each door, of-a mechanical tripping device for saidlocks movable with the elevator and self controlled means acting uponsaid device during approach of the elevator to each landing to rendersaid device temporarily ineffective, for the purpose set forth.

6. In a control mechanism for elevator landing doors, the combinationwith a lock for each door, of a mechanical tripping device for saidlocks movable with the elevator and tending to assume a trippingposition, and displacing means for said device whereby the latter istemporarily withdrawn from tripping position upon approach of theelevator to each landing and by power derived from the elevator. V I v7. In a control mechanism for the landing doors of an elevator, thecombination with a lock for each door, of a mechanical device movablewith the elevator and including a movable part tending to trip saidlocks automatically upon positioning of the elevator at theircorrespondinglandings, means for displacing said movable part fromtripping position upon approach ofsaid elevator to each landing andmeans for retarding return of said part to tripping position to therebynecessitate arrest of the elevator for tripping action thereof. Y

8. In a control mechanism for the landing doors of an elevator, incombination, a looking device for each door, each of said devices havinga tripping part, a device movable with the elevator to actuate saidtripping part of said locking devices, said actuating device beingbiased in a direction distinct from its direction of travel and beingineffective when displaced against its bias and means acting upon theapproach of the elevator to each landing to displace said actuatingdevice and release the same in landing position of the elevator.

9. In a control mechanism for the landing doors of an elevator, incombination, a looking device for each door, each of said deviceshavinga tripping part, a device movable with the elevator to actuatesaid tripping part of said locking devices, said actuating device beingbiased in a direction distinct from its direction of traveland beinginefiective when displaced against its bias, means opposing biasedmovement of said actuating device to insure a delayed return thereof,and means acting'upon the approach of the elevator to each landing todisplace said actuating device and release the same in landing positionof the elevator.

10. In a control mechanism for the landing doors of an elevator, thecombination with a lock for each door, a pivoted member movablewith theelevator and biased toward a position whereby the same tends to tripsaid locks automatically upon positioning of the elevator at theircorresponding landings, a plurality of stationary cams placement thereofwhereby the same is renlocated at each landing for displacing said deredineffective to trip said locks except member from tripping positionduring ap upon arrest of the elevator. 10 proach of the elevator intoeach landing po- In Witness whereof, We have each heresition and forreleasing the same in landing unto subscribed our names.

position of the elevator and a dash pot for WILLIS C. ARNOLD. retardingreturn of said member upon dis- WILLIAM E. DATE.

, Copies 01. this patent may be obtained for five cents each, byaddressing the fiommissioner of Patents,

Washington, D. G." V a

